using System;
using System.ComponentModel;

namespace nHydrate.Generator.Common.GeneratorFramework
{
	public abstract class BaseModelObject : INHydrateModelObject
	{
		#region Class Members

		protected string _key = Guid.NewGuid().ToString();
		protected INHydrateModelObject _root;
		protected bool _dirty = false;
		protected bool _cancelUIEvents = false;
		protected INHydrateModelObjectController _controller = null;

		#endregion

		#region Constructor

		public BaseModelObject(INHydrateModelObject root)
		{
			_root = root;
		}

		#endregion

		#region Events

		public event PropertyChangedEventHandler PropertyChanged;
		public event System.EventHandler DirtyChanged;

		protected void OnPropertyChanged(object sender, PropertyChangedEventArgs e)
		{
			this.Dirty = true;

			//Cancel UI events if necessary
			if (!this.CancelUIEvents)
			{
				if (this.PropertyChanged != null)
					this.PropertyChanged(sender, e);
			}
		}

		protected void OnDirtyChanged(object sender, System.EventArgs e)
		{
			if (this.DirtyChanged != null)
				this.DirtyChanged(sender, e);
		}

		#endregion

		#region Property Implementations

		[Browsable(false)]
		public virtual INHydrateModelObjectController Controller
		{
			get { return _controller; }
			set { _controller = value; }
		}


		[Browsable(false)]
		public virtual INHydrateModelObject Root
		{
			get { return (INHydrateModelObject)_root; }
		}


		[Browsable(false)]
		public virtual string Key
		{
			get { return _key; }
		}

		[Browsable(false)]
		public virtual bool Dirty
		{
			get { return _dirty; }
			set
			{
				//if (_dirty != value)
				//{
				_dirty = value;
				this.OnDirtyChanged(this, new System.EventArgs());
				if ((this.Dirty) && (this.Root != null) && (this != this.Root))
					this.Root.Dirty = true;
				//}
			}
		}

		[Browsable(false)]
		public virtual bool CancelUIEvents
		{
			get { return _cancelUIEvents; }
			set { _cancelUIEvents = value; }
		}

		/// <summary>
		/// Resets the unique key
		/// </summary>
		/// <param name="newKey"></param>
		public void ResetKey(string newKey)
		{
			if (string.IsNullOrEmpty(newKey))
				throw new Exception("The key value must have a value!");
			_key = newKey;
		}

		#endregion

		#region IXMLable Members

		public abstract void XmlAppend(System.Xml.XmlNode node);
		public abstract void XmlLoad(System.Xml.XmlNode node);

		#endregion

	}
}